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The purpose of the Rogation Days' service is to implore the mercy of God 
that He may keep us from all evils of soul and body, and give to the plants 
of the field an increase. In the spring, when the fields are becoming green 
and there is promise of a good harvest--but also the possibility of 
destruction through frost, hail, or rainstorms--the prayers and processions 
are a reminder to feeble man to turn with humility and confidence to the 
Giver of all good. For, it is not the earth alone which brings forth fruit, 
and not alone the busy hand of man on which the increase depends; but it is 
God who gives the increase.

Antiphon for the beginning of the Rogation service.
Arise, O Lord, assist us, and make us free because of Your name. We have 
heard with our ears O God, and our fathers have announced it to us. Glory 
be to the Father and to the Son, and to the Holy Spirit, as it was in the 
beginning, is now and ever shall be, world without end. Amen. Arise, O 
Lord, assist us and make us free because of Your name.

This antiphon is followed by the Litany of the Saints, the 1955 NCRL prayer linked above has the full text of the Rogation litany which is quite a bit longer than the Litany found in most Catholic prayerbooks these days.